<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
body{background-color:blue;}
.box{width:200px; height:200px; background:linear-gradient(to top, rgba(255,255,255,1) 30%, rgba(255,255,255,0)), url(%E4%BE%8B%E5%AD%90/img/mask.png);}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>
